Contribution Of Cation Addition To Mno(2)Nanosheets On Stable Co(3)O(4)Nanowires For Aqueous Zinc-Ion Battery

Zinc-based electrochemistry attracts significant attention for practical energy storage owing to its uniqueness in terms of low cost and high safety. In this work, we propose a 2.0-V high-voltage Zn-MnO(2)battery with core@shell Co3O4@MnO(2)on carbon cloth as a cathode, an optimized aqueous ZnSO(4)electrolyte with Mn(2+)additive, and a Zn metal anode. Benefitting from the architecture engineering of growing Co(3)O(4)nanorods on carbon cloth and subsequently deposited MnO(2)on Co(3)O(4)with a two-step hydrothermal method, the binder-free zinc-ion battery delivers a high power of 2384.7 W kg(-1), a high capacity of 245.6 mAh g(-1)at 0.5 A g(-1), and a high energy density of 212.8 Wh kg(-1). It is found that the Mn(2+)cations arein situconverted to Mn(3)O(4)during electrochemical operations followed by a phase transition into electroactive MnO(2)in our battery system. The charge-storage mechanism of the MnO2-based cathode is Zn2+/Zn and H(+)insertion/extraction. This work shines light on designing multivalent cation-based battery devices with high output voltage, safety, and remarkable electrochemical performances.